AMC has supplied us with new preview images from some of the upcoming episodes including gallery and portrait images of all the characters of The Walking Dead. Also check out the season synopsis, character descriptions, episode descriptions below and all the images in the gallery.

The highly anticipated fourth season returns on Sunday, October 13th where we see Rick and the group of survivors fostering a thriving community in the safe haven of the prison. Sadly, in this brutal world, happiness is short-lived and walkers and outside threats are no match for danger brewing inside the fences. The group’s home and new way of life will be thoroughly tested, and their struggle to survive has never been so perilous.

RICK GRIMES
Rick is slowly recovering from the loss of his wife. With new people at the prison, the group dynamic has changed dramatically and the pressures and threats have started to multiply. All along, Rick is fighting to return to the man he once was, but is it a battle he can win?

DARYL DIXON
While Daryl still struggles with the loss of his brother, he now has the opportunity to become a leader. Will he rise to the occasion?

GLENN RHEE
Glenn is working to mend his relationship with Maggie and keep her safe. Will his focus on survival clash with Maggie’s priority of living normal lives?

MAGGIE GREENE
Having regained her confidence, Maggie wants to somehow find a way to live, not just survive, even when the world is telling her that nothing else matters but staying alive.

CARL GRIMES
Carl has physically lost his mother, mentally lost his father, and emotionally lost himself. Rick wants Carl to step back from being a child soldier, and Carl is trying to honor those wishes. Will the world let him?

MICHONNE
Michonne has struggled to feel at ease in large, or even small, groups. And she too, has unfinished business. Where will she focus her efforts?

CAROL PELETIER
Carol has become a confident contributing member of the community. Now a formidable fighter, Carol is determined that no one become anything like the victim she used to be.

HERSHEL GREENE
As the voice of reason, Hershel will once again have to make life or death decisions. How long can he live by his core values? What's the cost of taking in so many new people with the threats around him increasing exponentially?

THE GOVERNOR
The Governor has unfinished business. What can stop a man when his mind is made up?

BETH GREENE
Beth appreciates her place within the larger group. She is a far cry from the suicidal teenager she once was. She is ready for love to find its way to her, but is she emotionally prepared?

TYREESE
Tyreese feels lucky to be alive. Will he be able to balance the loss the group has endured with his new relationship with Woodbury survivor, Karen?

SASHA
As Tyreese's scrappy no-nonsense younger sister, she might be the only person able to help Tyreese understand what the others have endured. Her practical approach to survival is challenged by the nature of their new threats and by the relationships that are developing.

KAREN
Though Karen is reluctant to use the term "boyfriend," she helps Tyreese understand what love means in this new world.

BOB STOOKEY
Like Michonne, Bob has secrets. He is fighting his own demons, and struggles to control them.

EPISODE 401: 30 Days Without An Accident
Rick and the group are as close to an ideal life as possible at the prison. Will they be able to hold on to humanity in the face of a new evil?

EPISODE 402: Infected
As the group faces a brand new enemy, Rick and the others must fight to protect the livelihood they worked so hard to create at the prison.

Based on the comic book series written by Robert Kirkman and published by Image Comics, “The Walking Dead” stars Andrew Lincoln, Norman Reedus, Steven Yeun, Lauren Cohan, Chandler Riggs, Scott Wilson, Melissa McBride, David Morrissey, Emily Kinney, Danai Gurira, Chad Coleman and Sonequa Martin-Green. The series is executive produced by Scott M. Gimple, Robert Kirkman, Gale Anne Hurd, David Alpert, Tom Luse and Greg Nicotero.